JPH07250662A - Thawing apparatus - Google Patents

Abstract

PURPOSE:To carry out good-quality thawing by suppressing partial perthawing which is liable to occur by high frequency heating. CONSTITUTION:A cooling air-controlling means 18 for controlling direction of cooling air or spreading of cooling air to a material to be thawed is provided in the flow inlet 7 of chill so as to uniformly apply the cooling air to the material 4 to be thawed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thawing device for thawing frozen products by high frequency irradiation and cold air circulation.

[0002]

2. Description of the Related Art Thawing of frozen products includes natural thawing, chilling in a refrigerator in a refrigerator, thawing using conduction heat or radiant heat in the thawing chamber, thawing using warm air, and thawing in a microwave oven. However, these thawing methods are very time-consuming and have large temperature unevenness (that is, uneven thawing), and it is difficult to obtain high-quality thawing. On the other hand, there has been considered a thawing method in which a high frequency is used to shorten the thawing time and a cool air is blown onto the surface of the object to be thawed to prevent the surface temperature from rising. In a conventional defrosting apparatus using such a defrosting method, a cold air circulation fan is rotated to introduce cold air into the defrosting chamber from the cold airflow inlet, or as disclosed in, for example, Japanese Utility Model Laid-Open No. 61-189188. In addition, an electric damper is provided in a duct through which cold air flows, and the electric damper is opened and closed to regulate the inflow of cold air into the thawing chamber. By the way, foods to be thawed include not only fish such as tuna and squid but also meat such as minced meat, steak meat and sliced meat, and confectionery such as ice cream and cakes, and the height of the object to be thawed, There are shapes. For this reason, as described above, it is difficult to uniformly apply cold air to the object to be thawed only by introducing the cool air from the cold air flow inlet into the thaw chamber. Therefore, depending on the object to be thawed, cold air does not uniformly hit the surface and the surface melts to 0 ° C or more, and due to the difference in the dielectric constant of ice and water characteristic of high frequency heating, that part is further heated and the temperature unevenness increases. For example, when tuna is thawed as a thawed product, the color changes and the taste is impaired. In addition, there may be a case in which thawing is not sufficient in the cooled area due to the cold air.

[0003]

As described above, the thawing method using high-frequency irradiation and cold air circulation heats the object to be thawed while cooling it as compared with ordinary high-frequency heating, so that the temperature difference between the vicinity of the center and the surface is small. Good thawing can be expected. However, if the object to be thawed is not uniformly exposed to cold air, heat concentrates on the part where the ice melts due to the nature of the high frequency.
Over-thawing may occur in a very short period of time, or the thawing may become insufficient due to the concentrated contact with cold air, and there is still a problem in performing good thawing without temperature unevenness.

Therefore, it is an object of the present invention to provide a defrosting device which can suppress partial overthawing which is likely to occur due to high frequency heating and can perform high quality defrosting.

[0005]

In order to solve the above-mentioned problems, the present invention is, firstly, a high-frequency heating means for irradiating a defrosting chamber covered with a metal with a high-frequency wave to heat an object to be defrosted, In a defrosting device comprising cooling means for flowing cold air into the defrosting chamber, a plurality of radio wave shielding vents are provided on the wall surface of the defrosting chamber, and one of the plurality of radio wave shielding vents is used as an inlet or the like. Cold air is circulated in the thawing chamber as an outflow port, and cold air adjusting means for adjusting the direction of the cold air or the spread of the cold air with respect to the object to be defrosted so that the cold air is uniformly applied to the object to be defrosted at the inflow port. The main point is to provide.

Secondly, two or more radio wave shielding vents are used as the inlets, and the cold air adjusting means varies the opening area and the opening position of each of the inlets or closes one of the inlets. The gist is that it is configured to adjust the direction of cold air and the inflow area of cold air with respect to the object to be thawed.

Thirdly, the gist of the cold air adjusting means is a straightening vane for adjusting the direction of the cold air with respect to the object to be thawed or the spread of the cold air.

Fourthly, in a thaw apparatus comprising a high-frequency heating means for irradiating a thaw chamber covered with metal with a high frequency to heat an object to be thawed, and a cooling means for introducing cold air into the thaw chamber, A plurality of radio wave shielding vents are provided on the wall surface of the thawing chamber, and cold air is circulated in the thawing chamber while using any one of the plurality of radio wave shielding vents as an inlet and the other as an outlet, and at the inlet. Is provided with cold air adjusting means for adjusting the direction of the cold air with respect to the object to be thawed or the spread of the cold air so that the object to be thawed is uniformly hit, and the height detecting means for detecting the height of the object to be thawed. And a control means for controlling the operation of the cold air adjusting means according to a detection signal from the height detecting means.

Fifth, in a thaw apparatus comprising a high-frequency heating means for irradiating a thaw chamber covered with metal with a high frequency to heat an object to be thawed, and a cooling means for introducing cold air into the thaw chamber, A plurality of radio wave shielding vents are provided on the wall surface of the thawing chamber, and cold air is circulated in the thawing chamber while using any one of the plurality of radio wave shielding vents as an inlet and the other as an outlet, and at the inlet. Is provided with cold air adjusting means for adjusting the direction of the cold air or the spread of the cold air with respect to the object to be thawed so that the cold object uniformly hits the object to be thawed, and further selecting the type of the object to be thawed for food selection The gist is to have a means and a control means for controlling the operation of the cold air adjusting means according to the information from the food selection means.

Sixth, in a thaw apparatus comprising high-frequency heating means for irradiating a thaw chamber covered with metal with high frequency to heat an object to be thawed, and cooling means for circulating cold air in the thaw chamber, The gist of the present invention is to have a thawing dish on which a net-like hole for introducing cold air is formed on the lower surface of the object to be thawed while the object to be thawed is placed and rotated.

Seventhly, the thawing dish comprises a plurality of annular belts having different diameters as a framework, and the plurality of annular belts have a wider belt width on the rotation axis side and each annular belt is from below. The gist is that the thaw dish is formed in a taper shape that narrows upward and the entire shape of the thawing dish is an inverted conical shape.

Eighth, in a thaw apparatus comprising a high-frequency heating means for irradiating a high-frequency object in a thaw chamber covered with metal to heat an object to be thawed, and a cooling means for circulating cold air in the thaw chamber, The gist of the present invention is to have a thawing dish on which the object to be thawed is rotated and a thawing dish height adjusting means for adjusting the height of the thawing dish according to the object to be thawed.

Ninth, the thawing plate height adjusting means has a movable plate attached to the rotary shaft of the thawing plate and a drive unit for moving the movable plate up and down.

[0014]

In the above structure, firstly, by adjusting the direction of the cold air or the spread of the cold air with respect to the object to be thawed so that the cold air uniformly hits the object to be thawed, the flow of the cold air is adjusted according to the object to be thawed. It is possible to make it, efficiently and uniformly apply cold air, and suppress partial over-thawing that tends to occur due to high-frequency heating, and it is possible to achieve high-quality thawing.

Secondly, the number of inflow ports is two or more, and the cold air adjusting means specifically varies the opening area and the opening position of each inflow port or closes one of the inflow ports to defrost the object to be defrosted. It is possible to uniformly and efficiently apply the cold air to the surface of the object to be defrosted by adjusting the direction of the cold air and the inflow area of the cold air.

Thirdly, the cold air adjusting means adjusts the direction of the cold air or the spread of the cold air with respect to the object to be thawed by the straightening plate, so that the cold air is uniformly and efficiently applied to the surface of the object to be thawed. Can be applied to.

Fourthly, the height detecting means detects the height of the object to be thawed, and the operation of the cold air adjusting means is controlled by the detection signal, which simplifies the operation of the thaw device and ensures the operation in a short time. It will be possible to perform high quality thawing.

Fifth, by selecting the kind of the object to be thawed by the food selection means and controlling the operation of the cold air adjusting means by the selection information, almost the same operation as described above can be obtained.

Sixth, by forming a mesh-like hole in the lower surface of the thawed plate for introducing cold air in the thawed plate on which the object to be thawed is rotated, cold air flowing under the thawed plate is cooled. The lower surface can be easily hit, and high-quality thawing without uneven heating can be realized.

Seventhly, the thaw plate is constructed by specifically constructing a plurality of annular bands having different diameters as a framework, and the plurality of annular bands have a larger band width on the rotation axis side and each band. The annular band is formed with a taper that narrows from the bottom to the top, and the shape of the entire thawing dish is an inverted conical shape, so that the bottom surface of the thawed object is more likely to be hit with cold air and uniform thawed. It will be possible.

Eighth, by adjusting the height of the thawing dish on which the object to be thawed is rotated, according to the object to be thawed,
The object to be thawed can be moved to almost the center of the flow of cold air, and the cold air can uniformly and efficiently hit the object to be thawed to perform high-quality thawing.

Ninth, the means for adjusting the height of the thawing dish is:
Specifically, the height of the thawing dish is adjusted easily and surely by comprising a movable plate attached to the rotary shaft of the thawing dish and a drive unit for moving the movable plate up and down. It becomes possible.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing a first embodiment of the present invention. As shown in FIG. 1, a thawing device 1 is provided with a door 2 having a mechanism for preventing high-frequency leakage, a thawing chamber 3 made of metal around the thawing unit 4, and a thawing object 4 for rotating. A rotating dish 5, a waveguide opening 6 for feeding high frequency waves into the thawing chamber 3, a cold airflow inlet 7 and a cold airflow outlet 8 for circulating cold air in the thawing chamber 3 are provided, and a display unit is provided outside the thawing chamber 3. 9, an operation unit 10, and input means 11 for inputting conditions necessary for decompression. The cold air flow inlet 7 and the cold air flow outlet 8 are radio wave shielding vents that block high frequencies, and the vents are made of punching metal, for example. Further, as shown in FIG. 2, the defrosting chamber 3 and the cold air circulation passage 21 are provided.
Is covered with a heat insulating material 12, and the cold air circulation fan 13 is rotated to send the air cooled by the cooler 14 as a cooling means to the thawing chamber 3. The cooler 14 is connected to the compressor 16. A high frequency generator 15 as a high frequency heating means is connected to the waveguide opening 6 by a waveguide not shown. The high frequency generator 15 is controlled by a control circuit 17 as a control means. The object to be thawed 4 on the rotary plate 5 is rotated by the rotary plate motor 20 when heating is started. On the cold air circulation passage 21 side of the cold air flow inlet 7, a cold air adjusting means 18 for closing a part of the cold air flow inlet 7 is provided. It is possible to change the position and area where cold air comes out. Although not shown, this drive mechanism can be easily realized if a gear is attached to the motor and the claws that engage with the gear in the vertical direction are cut at the ends of the blocking plates 18a and 18b.

Next, the operation of the decompression device 1 having the above configuration will be described. First, the defroster 1 operates the compressor 16 in advance to cool the air with the cooler 14, and the cool air circulation fan 13
Is rotated to sufficiently cool the thaw chamber 3 to, for example, 0 ° C. or lower. The door 2 is opened, the object to be thawed 4 is placed on the rotary plate 5, the door 2 is closed, the conditions necessary for the condition for defrosting the object to be thawed 4 are input to the input means 11, and the operation section 10 is operated to thaw. Is started. At this time, the input content and the operation status are displayed on the display unit 9. With the operation to start defrosting,
The rotary dish motor 20 is energized to rotate the object to be defrosted 4, and high frequency is supplied from the high frequency generator 15 to the defrosting chamber 3 to heat the object to be defrosted 4. At this time, the compressor 16 and the cold air circulation fan 13 are continuously or intermittently operated to blow cold air of, for example, −10 ° C. into the defrosting chamber 3 from the cold airflow inlet 7 and apply high frequency to the object to be defrosted 4 while applying cold air. Thaw by heating.

In such a thawing operation, in the present embodiment, the position and area where the cold air flows can be changed by the cold air adjusting means as shown in FIG. Therefore,
When the object to be thawed 4 as shown in FIG. 2 is a food without a height such as a tuna fence or thinly sliced meat, the blocking plate 1 of the cold air adjusting means 18
8a and the blocking plate 18b are both lowered (for example, 18
(c is set to the position A), and the cooling air is made to flow evenly above and below the object to be thawed 4. In addition, when the food to be thawed 4 has a height such as a short cake as shown in FIG. 4, the blocking plate 18a of the cold air adjusting means 18 is raised (for example, 1
8c is set to the position E), and the cooling air is allowed to flow over a wide area above and below the object to be thawed 4. In this way, the position and area of cold air flowing from the cold airflow inlet 7 depending on the food can be changed, and the cold air can be uniformly and effectively applied to the food surface.

In this embodiment, one cold air flow inlet 7
The cold air adjusting means 18 is provided so as to block a part of
There are two or more cold airflow inlets 7, and each cold airflow inlet is provided with a cold airflow adjusting means, and the area and position of each cold airflow inlet is changed or one of the cold airflow inlets is closed, so that the cold air to the defrosted object is cooled. The direction and the inflow area of cold air may be adjusted.

Next, a second embodiment will be described with reference to FIG. In this embodiment, a plurality of wind direction plates (rectifying plates) are used as the cold air adjusting means 19. In the example of the figure, three wind direction plates are used, and three wind direction plates 19a, 19b, 19c are used.
It is possible to adjust the inclination of each of them independently by a method of rotating a shaft supporting them by a motor. As a result, when the object to be thawed 4 has a low height, the cold air flow inlet 7 side of the wind direction plate 19a is lowered so that the flow of the cool air is concentrated near the height of the rotary plate 5, and as shown in FIG. When the object 4 is large and tall, the object 4 is raised to the ceiling side and the cold air flows in vertically from the cold airflow inlet so that the object 4 to be defrosted is uniformly exposed to the air. In this way, the position or direction of the cold air flowing from the cold airflow inlet 7 depending on the food is changed to adjust the direction of the cold air or the spread of the cold air with respect to the object to be defrosted 4 so that the cold air is uniformly and efficiently applied to the food surface. Can be applied to. Although the wind direction plates 19a, 19b and 19c are provided outside the thawing chamber 3 in this embodiment, they may be provided inside the thawing chamber 3 as long as there is no problem in terms of high frequency.

Next, a control method common to the cold air adjusting means 18 and 19 in each of the above embodiments will be described. FIG. 6 shows a first example in which an optical sensor is used, and a hole capable of blocking radio waves is formed at a height of both wall surfaces facing each other of the defrosting chamber 3. The light emitting element 22 is provided on one of the back sides of the holes,
The light receiving element 23 is attached to the other side. For example, if light is emitted from the light emitting element 22a and the light receiving element 23a senses the light, there is no object to be defrosted 4 at that height, and if light receiving element 23a does not sense even if light is sent, it is defrosted to that height. The control circuit 17 determines that the object 4 is present. FIG. 7 shows which position in FIG. 3 the cutoff plate 18a of the cold air adjusting means 18 is controlled according to the height of the object to be defrosted 4 by turning on when light is sensed and turning off when light is not sensed. . For example, when the object to be thawed 4 is set on the thaw plate 5 in the thaw chamber 3 and the operation for starting the thaw is performed, the control circuit 17 causes the light emitting element 22 to emit light, and 23a, 23b, 2
3c, 23d, and 23e are OFF, OFF, OFF, O
When it is N or ON, the lower end 18c of the blocking plate 18a is moved to the position C, and high frequency heating is performed while blowing cold air. In this way, it is possible to detect the height of the object to be thawed 4 and automatically create an optimum flow of cold air for the object to be thawed 4. As a result, the cold air uniformly hits the object to be thawed 4,
High-frequency heating enables high-quality thawing in a short time. In this example, an optical element is used to detect the height of the object 4 to be defrosted. However, an ultrasonic element as disclosed in Japanese Patent Laid-Open No. 63-21421 is used as the ceiling of the defrosting chamber 3. A method of mounting on a surface and detecting the height by transmitting / receiving may be used.

Next, a second example of the control method will be described with reference to FIGS. 8 and 9. FIG. 8 shows a configuration example of the input means 11. The objects to be defrosted 4 can be generally classified into meat, fish and confectionery having different shapes and final thawing temperatures. Therefore, as the first key group, meat 11a, fish 11
b, a confectionery 11c is provided, and a second key group (Large 11d, Medium 11e, Small 11) for inputting the size or amount thereof is provided.
f) is provided. By selecting and inputting this key, when the control circuit 17 starts thawing with the heating pattern for thawing according to this input, the blocking plate 18a of the cold air adjusting means 18 is moved as shown in FIG. 9 to be thawed. Cold air suitable for the object 4 can be made to flow from the cold airflow inlet 7.

As described above, in the thawing device using high-frequency irradiation and cold air circulation, the thaw plate is rotated so that there is no temperature unevenness by high-frequency heating. However, in a conventional thawing dish on a flat dish, the back surface of the object to be thawed 4 is not exposed to cold air, and the above-mentioned local temperature rise easily occurs. Therefore, in each of the above-described embodiments, the thaw dish 5 having the following structure is provided so that the cold air can well hit the back surface of the object to be thawed 4. FIG. 10A is a perspective view and FIG. 10B is a sectional view thereof. Thaw plate 5
Is a plurality (three in the illustrated example) of annular bands 5 having different diameters.
a, 5b, 5c are configured as a skeleton portion, and these annular bands 5a, 5b, 5c have a larger band width on the rotation shaft side (5a side) and each annular band 5a, 5b, 5c is from the bottom to the top. Thaw plate 5 is formed in a taper shape that narrows toward
The whole shape of is a conical shape. With such a configuration, the thawing dish 5 has a structure in which a mesh-like hole for guiding cold air is formed on the back surface of the object to be thawed. As a result, the cold air flowing under the thawing dish 5 can easily hit the back side of the object to be thawed, and the object to be thawed 4 can be cooled in the same manner as the front side, and good thawing without uneven heating can be achieved. Can be realized.

FIG. 11 shows a third embodiment of the present invention.
What has been described so far is to match the flow of cold air with the object to be thawed 4, but the same effect can be expected by changing the height of the object to be thawed 4 with a constant flow on the cold air side. . FIG. 13 shows a configuration example of a thawing dish height adjusting means capable of adjusting the height of the thawing dish 5. The thawing dish 5 is supported by a rotary shaft 25 with a gear 26,
It is connected to a gear attached to the shaft of, and the thawing plate 5 is rotated by the rotation of the rotary plate motor 20. At the lower end of the rotary shaft 25, a movable plate 2 that can be moved up and down by a drive unit 29.
8 is provided, and the height of the object 4 to be defrosted in the defrosting chamber 3 can be adjusted by a signal from the control circuit 17. Therefore, the object to be defrosted 4 is controlled by the control circuit 17 based on the information from the height detecting means shown in FIG. 6 or the food selecting means shown in FIG.
The movable plate 28 is moved up and down so as to come near the center of the cold air blown out from the cold airflow inlet 7. As a result, the cold air uniformly hits the object to be thawed, and high-quality thawing becomes possible.

As described above, the thaw device has been described in each of the embodiments, but even if the thaw chamber 3 is incorporated in the refrigerator, the same effects as those of the respective embodiments can be obtained. FIG. 12 shows a configuration in which the thawing chamber 3 is integrally incorporated in the refrigerator 24. The high frequency heating device 15 is used as the heat insulating material
It is installed on the outside of the upper part of the back surface and has a structure in which the cooler 14 and the compressor 16 of the refrigerator 24 are shared. This shared structure can be easily realized.

[0033]

As described above, according to the present invention,
First, since the cold air inlet is provided with a cold air adjusting means for adjusting the direction of the cold air or the spread of the cold air with respect to the object to be thawed so that the cold air is uniformly applied to the object to be thawed, A cold air flow can be created, and the cold air can be efficiently and uniformly applied. Therefore, it is possible to suppress partial over-thawing which is likely to occur due to high-frequency heating and realize high-quality thawing.

Secondly, the number of cold air inlets is two or more, and the cool air adjusting means specifically varies the opening area and the opening position of each inlet or closes one of the inlets. Since the configuration is such that the direction of the cold air with respect to the thawed product and the inflow area of the cold air are adjusted, the cold air can be uniformly and efficiently applied to the surface of the thawed product.

Thirdly, since the cold air adjusting means is specifically constituted by a straightening vane for adjusting the direction of the cold air with respect to the object to be thawed or the spread of the cold air, the cold air is applied to the surface of the object to be thawed in the same manner as above. It can be applied uniformly and efficiently.

Fourth, since the height detecting means for detecting the height of the object to be thawed and the control means for controlling the operation of the cold air adjusting means according to the detection signal from the height detecting means are provided. The operation of the defrosting device is simplified, and high-quality defrosting can be reliably performed in a short time.

Fifth, since the food selection means for selecting and inputting the type of the thawed material and the control means for controlling the operation of the cold air adjusting means according to the information from the food selection means are provided. Similarly to the above, the operation of the thawing device is simplified, and high-quality thawing can be reliably performed in a short time.

[0038] Sixth, since a net-like hole that guides cold air to the lower surface of the thaw plate is formed in the thaw plate on which the thaw product is placed and rotates, the cool air flowing under the thaw plate is directed to the lower surface of the thaw plate. It can be easily applied to the skin, and good quality thawing without uneven heating can be realized.

Seventhly, the thawing dish comprises a plurality of annular belts having different diameters as a framework, and the plurality of annular belts have a wider belt width on the rotation axis side and each annular belt is from below. Since the thawing dish is formed in a tapered shape that narrows upward and the entire shape of the thawing dish is an inverted conical shape, it is possible to more easily apply cold air to the lower surface of the thawing object.

Eighth, since the height of the thawing dish on which the object to be thawed is rotated is adjusted according to the object to be thawed, the object to be thawed can be moved to the center of the flow of cold air. As a result, the cold air uniformly and efficiently hits the object to be thawed, and high-quality thaw can be realized.

Ninth, since the means for adjusting the height of the thawing dish is equipped with a movable plate attached to the rotary shaft of the thawing dish and a drive unit for moving the movable plate up and down. The height of the thawing dish can be adjusted easily and surely.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a door is opened in a first embodiment of a thawing device according to the present invention.

FIG. 2 is a sectional view showing an internal structure of the first embodiment.

FIG. 3 is a front view showing a cool air adjusting means in the first embodiment.

FIG. 4 is a cross-sectional view of the cold air adjusting means under different conditions in the first embodiment.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration example of height detection means applied to each of the above-described embodiments.

FIG. 7 is a diagram showing a positional relationship between a detection signal of the height detecting means and a blocking plate of the cold air adjusting means.

FIG. 8 is a diagram showing a configuration example of food selection means applied to each of the above-described embodiments.

FIG. 9 is a diagram showing a positional relationship between a key input of the food selection means and a blocking plate of the cold air adjusting means.

FIG. 10 is a diagram showing a configuration of a thawing dish applied to each of the above-mentioned embodiments.

FIG. 11 is a configuration diagram showing a third embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view showing a structural example in which the defrosting device of the present invention is integrally incorporated in a refrigerator.

[Explanation of symbols]

 3 Thawing Room 4 Thawing Material 5 Thawing Plate 5a, 5b, 5c Annular Band 7 Cold Air Flow Inlet 8 Cold Air Flow Outlet 11 Input Means as Food Selection Means 14 Cooler (Cooling Means) 15 High Frequency Generator (High Frequency Heating Means) 17 Control circuit (control means) 18, 19 Cold air adjusting means 18a, 18b Blocking plate 19a, 19b, 19c Wind direction plate (rectifying plate) 22 Light emitting element 23 Light receiving element constituting height detecting means with light emitting element 25 Rotating shaft 28 Movable plate 29 Drive

Claims (9)

[Claims] 1. A defrosting apparatus comprising: a high-frequency heating means for irradiating a defrosting chamber covered with metal with a high frequency to heat an object to be defrosted; and a cooling means for flowing cold air into the defrosting chamber. A plurality of radio wave shielding vents are provided on the wall surface of the chamber, and cold air is circulated in the defrosting chamber using any one of the radio wave shielding vents as an inlet and the other as an outlet, and the inlet is provided with the A defrosting device comprising: a cold air adjusting means for adjusting the direction of the cold air or the spread of the cold air with respect to the object to be thawed so that the cold air uniformly hits the object to be thawed. 2. The two or more radio wave blocking vents are used as the inflow ports, and the cold air adjusting means varies the opening area and the opening position of each of the inflow ports or closes any one of the inflow ports. The thawing device according to claim 1, wherein the thawing device is configured to adjust the direction of the cold air and the inflow area of the cold air with respect to the object to be thawed. 3. The thawing device according to claim 1, wherein the cold air adjusting means comprises a straightening vane for adjusting the direction of the cold air or the spread of the cold air with respect to the object to be defrosted. 4. A defrosting apparatus comprising: a high-frequency heating means for irradiating a defrosting chamber covered with metal with a high frequency to heat an object to be defrosted; and a cooling means for flowing cold air into the defrosting chamber. A plurality of radio wave shielding vents are provided on the wall surface of the chamber, and cold air is circulated in the defrosting chamber using any one of the radio wave shielding vents as an inlet and the other as an outlet, and the inlet is provided with the Provided with cold air adjusting means for adjusting the direction of the cold air or the spread of cold air with respect to the object to be thawed so that the cold object uniformly hits the object to be thawed, and height detection means for further detecting the height of the object to be thawed, A defrosting device comprising: a control unit that controls the operation of the cold air adjusting unit according to a detection signal from the height detecting unit. 5. A defrosting apparatus comprising: a high-frequency heating means for irradiating a thawing object covered with metal with a high frequency to heat an object to be defrosted; and a cooling means for introducing cold air into the defrosting chamber. A plurality of radio wave shielding vents are provided on the wall surface of the chamber, and cold air is circulated in the defrosting chamber using any one of the radio wave shielding vents as an inlet and the other as an outlet, and the inlet is provided with the Provided with cold air adjusting means for adjusting the direction of the cold air or the spread of cold air with respect to the object to be thawed so that the cold object uniformly hits the object to be thawed, and food selection means for selecting and inputting the type of the object to be thawed. And a control means for controlling the operation of the cold air adjusting means according to the information from the food selection means. 6. A thaw apparatus comprising: a high-frequency heating means for irradiating a thaw chamber covered with metal with a high frequency to heat an object to be thawed; and a cooling means for circulating cold air in the thaw chamber. A thawing device having a thawing dish having a net-like hole for guiding cold air on the lower surface of the object to be thawed while the object is placed and rotated. 7. The thaw plate comprises a plurality of annular bands having different diameters as a framework, and the plurality of annular bands have a larger band width on the rotation axis side, and each annular band extends from the bottom to the top. 7. The thawing device according to claim 6, wherein the thawing dish is formed in a taper shape that narrows toward the bottom, and the entire shape of the thawing dish is formed in an inverted conical shape. 8. A defrosting apparatus comprising: a high-frequency heating means for irradiating a defrosting chamber covered with metal with a high frequency to heat an object to be defrosted; and a cooling means for circulating cold air in the defrosting chamber. A defrosting apparatus comprising: a defrosting dish on which a defrosted product is placed and rotated, and a defrosting dish height adjusting means for adjusting the height of the defrosting dish according to the object to be defrosted. 9. The thawing plate height adjusting means has a movable plate attached to a rotary shaft of the thawing plate and a drive unit for moving the movable plate up and down.
The described defroster.